Original step-and-shoot plan | Conversion | Converted mARC plan | |
---|---|---|---|
Prostate | |||
Version a | 19 beams | Convert directly as is | 8 arclets |
35 segments | 11 hybrid fields | ||
Version b | 19 beams 35 segments Same plan as version a | Split beams with more than 1 segment into two beams spaced 4° apart (one beam −2°, one +2° relative to original), this gives 26 beams, then convert | 22 arclets 4 hybrid fields |
Version c | 30 beams 35 segments | Convert directly | 25 arclets 5 hybrid fields |
Head and neck | |||
Version a | 18 beams 50 segments | Split each beam with More than 1 segment into two beams spaced 6° apart (one beam −3°, one +3° relative to original) | 26 arclets 5 hybrid fields |
Version b | 36 beams | Convert directly | 27 arclets |
50 segments | 9 hybrid fields | ||
Version c | 36 beams 72 segments | Do not change beams, but order segments in a way that two rotations are made, so the first segment of each beam is irradiated on the cw arc; the rest of the segments are included in the ccw arc | Clockwise: pure mARC including only 36 arclets (not hybrid) Counter-clockwise: 23 arclets, 6 hybrid fields |